The SF-226 "Bloodhound" is a modification of SF-102 "Hellhound" ([link]
Four 20 mm cannon replaced by two 37 mm cannon, added two hardpoint for ordnance.
Under nose, in pod, added IRST (Infra-red search and track)
(I found some information about using infrared system by Germany at WWII, for example - Messerschmitt Bf 110D-1/U1 had nose mounted infrared detector [link]
This aircraft have two man crew: first is a pilot, second is a IRST system operator, radio operator, navigator and bombing sight operator.
Some changes into airframe (cokpit shifted forward, for better view, canards has a forward swept and dihedral angle, wings have winglets), new high-power engine and new, six-bladed propellers.
Now this aircraft is a all-weather fighter, ground attack aircraft, and this save escort, air superiority and reconnaissance capability